Unset kubernetes vars for unit tests

[dfajmon]

What this PR does / why we need it:
Unset Kubernetes vars for unit tests.
Unit tests fail on the cluster when KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT are set. Unit tests shouldn't be affected by these variables even in the testing environment on the cluster.

Testing done:
Unit tests pass.

Special notes for your reviewer:

Release note:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dfajmon
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[k8s-ci-robot]

Hi @dfajmon. Thanks for your PR.

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[gnufied]

/ok-to-test

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/lifecycle stale